Mars' strange gullies are not carved by water as once thought. New research shows sand and seasonal carbon dioxide ice are ...

Add Yahoo as a preferred source to see more of our stories on Google. Almost perfectly circular sand dunes dot the surface of Mars. Almost perfectly circular sand dunes dot the surface of Mars. NASA's ...

This story was updated on May 10 at 11 a.m. ET. Towering sand dunes on Mars, once thought to be ancient and unchanging, are actually dynamic and active today, new satellite observations show. Using ...

As humanity’s robot rovers continue to roll over and scan the surface of Mars, we continue to see the Red Planet in unprecedented detail. In a new video released by NASA’s Jet Propulsion Laboratory ...